<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script src="./Promise-class.js"></script>
    <script>
      //实例化对象
      let p = new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve("OK");
        }, 1000);
      });

      p.then((v) => {
        console.log(111);
      })
        .then((v) => {
          console.log(222);
          return new Promise(() => {});
        })
        .then((v) => {
          console.log(333);
        })
        .then((v) => {
          console.log(444);
        });
    </script>
  </body>
</html>
